I'm tidying up my friends list (which I do occasionally, especially when the list of friended accounts exceeds 500 and my profile page breaks). I'm only removing accounts or communities which haven't had any activity for years.

On this occasion, as part of the process I've also deleted a couple of communities for which I'm the sole maintainer -- if there's stuff from them you wanted to retrieve give me a shout, there's about 30 days before their content is wiped and they can't be undeleted.